OEDForms: Also inconie, in-conie, in conie, inconey, in conye.Etymology: A cant word, prevalent about 1600, of unascertained origin. It appears to have rhymed with money , compare coney n.1 Suggestions as to its derivation are that it represents French inconnu , or Italian incognito , unknown; that it is a variation of uncanny , unconnyincautious, etc. (see canny adj.); that it is connected with unco unknown, strange, etc.; but none of these is free from difficulty.

The OED uses the past tense in guessing how the word might have been pronounced. Its meaning is likewise veiled in the mists of time.